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Animal cells have the following organelles: A nucleus which controls the activities of the cell and stores the cell DNA; cytoplasm where most of the cell's chemical reactions take place; a cell membrane whic...

Diffusion Diffusion is the process in which particles/ substances spread out in a solution or a gas. The result of this process is that particles move down the concentration gradient from an area of high con...

There are three main reasons for this, firstly, the 1800s when Charles Darwin lived was a deeply religious time and the idea of evolution challenged the idea of God creating life on Earth. Secondly, not much...

An adaptation is a feature or characteristic that allows an organism to live and survive successfully in a habitat. Animals living in cold environments, such as the polar bear, may have a small surface area ...

First off we need to understand what natural selection is. Natural selection is the mechanism proposed by Charles Darwin in his theory of evolution. The key points you need to know for this are: 1) that indi...